Pixelate image
Apply a mosaic effect to the whole image and download a copy.
Private: it runs in your browser and your file is never uploaded. How to check it
Up to 25 MB · 40 megapixels · 16,384 px per side. Processed locally.
You can also drag or paste (Ctrl+V) an image onto this page.
View generated image
Reprocessing can change metadata and color profiles. JPG does not preserve transparency. Inspect background and opacity in the preview; each tool’s settings determine the result.
Your files are processed here, on your device
We do not send the contents of your files or text to any server: everything is processed in your browser’s memory. No account is needed, there is no daily quota and we use no analytics or trackers. Each tool has size limits to protect your device’s memory.
A connection is only needed to load the site. After that you can disconnect and the tools keep working (some previews may need the connection). Hosting may receive technical visit data. Favorites store only tool identifiers in this browser.
How we handle your data →How to use this tool
- Load a PNG, JPG or WebP image.
- Choose block size, output format and quality.
- Process and compare the preview before downloading a copy.
An example you can verify
Apply a mosaic effect to an image for a design.
Example input
400 × 200 px sample image.
Expected result
400 × 200 px PNG produced from a 20 × 10 cell grid.
Try these files containing fictitious data:
Download sample · image-400x200.pngFinal dimensions stay unchanged. The effect covers the whole image and does not securely redact private data.
Pixelate image: uses and practical guidance
Pixelating an image creates a block effect that simplifies visual detail. It can be used for a graphical composition or to reduce the apparent definition of a picture before displaying it. Block size determines how much detail remains: smaller blocks retain more recognizable features, while larger blocks create more abstract shapes. The effect follows the tool’s actual processing scope, so inspect the whole exported image rather than assuming only a particular subject has changed.
Do not treat pixelation as guaranteed anonymization. A face, vehicle plate or passage of text may remain recognizable through context, shape or surrounding information. Some tasks require removing a region entirely or using an editing procedure that actually eliminates sensitive data. For an aesthetic effect, experiment with a test source. For privacy, verify that the selected method is appropriate to that objective and does not merely make the information less immediately obvious.
Consider publication scale. An effect that looks strong when enlarged may be perceived differently in a thumbnail. Large letters and simple silhouettes can remain identifiable even with larger blocks. The tool does not automatically identify personal information or decide which details should be hidden. File names, screenshot edges and surrounding elements can also reveal information about a scene, so those deserve review alongside the main visual subject.
Open the download at its final display size and check what remains visible. Store the original appropriately and distribute only the reviewed version. Crop image changes framing, while Grayscale image provides a tonal effect. When preparing public material, assess the necessity of each visible element before selecting a detail reduction effect. A changed appearance is useful evidence of the transformation, but not proof that all sensitive information has been removed.
Settings and limits
Load a PNG, JPG or WebP and choose a block size from 2 to 256 pixels. The image is reduced to a grid and enlarged without smoothing, preserving its dimensions. Larger blocks produce a stronger effect. Choose output format and quality. Maximum 25 MB, 40 megapixels and 16,384 px per dimension.
Frequently asked questions
Does this securely hide private information?
No. This applies a visual effect to the whole image, rather than secure redaction. Features may remain recognizable and pixelation does not guarantee information cannot be recovered.
Are my data stored on a server?
No. Content and files are processed in your browser without an account. Closing the page loses unsaved results.
Is it free, and do I need to sign up?
Yes, it is free. You do not need to sign up, create an account or install an app, and there is no daily quota: open the tool and use it. The only limits are file sizes, which protect your device’s memory.
Does it leave a watermark on the result?
No. Snipshed adds no watermark, logo or text of its own to the files you download: the result is yours exactly as you configured it.
Does it work on iPhone and Android?
Yes, from your phone’s browser (Safari, Chrome…) and without installing any app. When it finishes, the file is saved from the browser itself: on iPhone it appears in the Files app and on Android in Downloads. With very large files the phone may run out of memory; try a smaller file or a computer.